void timerCallback(object stateInfo)
{
showingTooltip = !showingTooltip;
Controller controller = Controller.Instance;
GraphicViewManager gvm = GraphicViewManager.Instance;
//gvm.Presenter.TrackingPaintImmediately(this, null, gvm.ActiveView, controller.TrackingController);
gvm.Presenter.TrackingPaint(this, null, gvm.ActiveView, controller.TrackingController);
}